Expert
Master
noun
A person whose name is known (because he's famous?). Why is this person's name known? Why is this person famous? It's because they are an expert / master at something. How else does someone become famous or well-known? That's pretty much it, even if they're just an expert at being an idiot.
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 人 has two on'yomi readings, here's a mnemonic to help you remember which one to use:
Did you know that every expert has their own pair of May jeans (めいじん)? A true master of anything has a specific pair of jeans they wear only in the month of May. That's what makes them so good at what they do.
パソコンの名人
a computer whiz
チェスの名人
a chess master
カルタの名人
a master at karuta
父はフリスビーの名人です。
My father is a frisbee expert.
スキーの名人になるには、どうしたらいいですか？
What should I do to become an expert skier?
あの女の人はチェスの名人であるだけでなく、ブラックジャックの名人でもある。
That woman is not only a chess master, but a master of Blackjack.